Swivel chair



FIG. 1 is a front view of a swivel chair;

FIG. 2 is a back view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top front left perspective view thereof; and,

FIG. 7 is a right side view thereof.

The broken lines show portions of the swivel chair and form no part of the claimed design. 

CLAIM The ornamental design for a swivel chair, as shown and described. 